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CHEM A Practice Test Flashcards | StudBud
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CHEM A Practice Test
CHEM A Practice Test
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First semester chemistry final review
Flashcards
33 cards
F
Practice quiz
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Host live
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Questions
33
Answers
1
As wavelength increases, both energy and frequency decrease.
False
True
2
In Bohr's model the electrons are arranged in orbitals according to the energy they contain.
False
True
3
Which of the following lists the forms of nuclear radiation in order of increasing danger.
alpha, beta, gamma
gamma, alpha, beta
beta, alpha, gamma
gamma, beta, alpha
4
The absorption and emission spectrum of the same element are overlaid = continuous spectrum.
False
True
5
What is the correct name for Cu
2
SO
4
?
copper (I) sulfate
copper (I) sulfate
copper (II) sulfate
copper (II) sulfide
6
The energy contained in a photon emitted can be correlated to an exact color of light.
True
False
7
Which analogy correctly relates the sizes of the three subatomic particles?
P+ and n0 are to basketballs as the electron is to a marble.
Protons, neutrons, and electrons are all the same size.
N0 and e- are to ping pong balls as p+ are to a tennis ball.
P+ and e- are to basketballs as n0 are to a soccer ball.
8
The discrete units of energy required for e
-
to move from one energy level to the next are ___.
quantum
calories
joules
volts
9
Which of the following are true about valence electrons?
Valence electrons are transferred in covalent bonds.
Valence electrons are free to drift in metals.
Valence electrons determine an elements chemical properties.
Group 17 elements gain 1 electron to complete their octet.
10
What is the correct formula for ammonium phosphide?
(NH3)3P
(NH3)4PO4
(NH4)3PO4
(NH4)3P
11
Which of the following are true about valence electrons?
Group 15 elements have 5 valence electrons.
Valence electrons are found in the nucleus.
Period 3 elements have 3 valence electrons.
Metals lose their valence electrons to become cations.
12
The emission spectrum of each element is unique and can be used like a fingerprint.
True
False
13
What is the correct name for the following compound SrBr
2
?
strontide bromine
strontium bromide
strontium bromine
strontium dibromide
14
A water molecule is ________________.
held together by hydrogen bonds
covalently bonded
dihydrogen monoxide
essential for life
15
Elements are identified by the number of ________ they contain.
protons
electrons
neutrons
isotopes
16
The energy emitted during a nuclear reaction is ∝ to that emitted during a chemical reaction.
True
False
17
Ionic bonds form between ____________________.
a metal and a non metal
two nonmetals
two metals
18
Ernest Rutherford discovered the ________ of the atom and described it as being _____ and ____.
electron cloud, large, negative
electron cloud, small, negative
nucleus, small, positive
nucleus, large, positive
19
J.J. Thomson used a cathode ray tube to study the properties of the electron.
True
False
20
Isotopes are atoms of the same element that contain a different number of _________.
protons
neutrons
electrons
21
Lithium atoms contain 3 protons, 3 electrons, and 7 neutrons.
False
True
22
Hydrogen and helium are the most abundant elements found in Earth's crust.
Yes
No
23
Electrons move from their ground state to an excited state when they emit energy.
True
False
24
Elements in the same group have the same number of valence electrons.
False
True
25
_____ are highly conductive of both heat and electricity and are both ductile and malleable.
Nonmetals
Noble gases
Metals
Metalloids
26
Select all of the following that support the common origin of all matter in the universe.
Cosmic Background Microwave Radiation
Same emission spectrum of atoms on on Earth and universe.
Doppler Effect - Red shift of light from distant galaxies.
Pd and U are the most abundant elements in the universe.
27
Protons and neutrons are found in the nucleus while electrons are found in the cloud.
False
True
28
The elements with the highest electronegativity on the periodic table are at _________.
the bottom, left
the top, left
the top, <br>right
the bottom, right
29
How many half lives have passed if 125 g of material remain and the original sample is 1000 g?
3
5
4
2
30
Daltons atomic theory included all the following except ____.
Each element has unique particles.
Isotopes of the same element have slightly different masses.
Matter is composed of tiny particles.
The tiny particles of matter are indivisible.
31
Elements in the same period are more similar than those in the same group.
False
True
32
A water molecule is ________________.
trigonal pyramidal
polar
bent
non polar
33
Nuclear fission splits _______ nuclei making them ______ stable.
small, more
large, more
large, less
small, less
